{"id":"8c1efa2a-2269-4afe-bdbd-5322266d4fc4","shortId":"wtBAL3","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (specifically for transaction ID 12) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed — `/api/v1/transactions/12/receipt` — returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage deployment of x402-powered APIs rather than a mature production service.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The endpoint path references a specific transaction ID (12); it is unclear whether this is parameterized or a fixed demo resource","No response schema or example payloads are documented anywhere","The platform may be a demo/proof-of-concept rather than a production service","No information on what data the receipt actually contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/12/receipt","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/12/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The specific endpoint path (/transactions/12/receipt) suggests a hardcoded resource rather than a parameterized API. This is effectively a stub 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'/api/v1/transactions/12/receipt':111 '/docs':177 '/pricing':179 '/readme':181 '0.02':93,133 '000':120 '0x8335':125 '12':42 '20':119 '2913':126 '300':144 '402':114 '6':129 'Base network API' 'USDC micropayment API' 'accept':149 'access':163 'actual':211 'advertis':51,162 'ai':63 'analysi':67 'analyt':62 'api':59,156,229 'appear':215 'application/json':154 'base':8,22,101,121,128 'base-network' 'behind':43 'broader':48 'call':12,26 'chain':170 'challeng':115 'classif':69 'connect':187 'contain':212 'content':193 'convers':86 'crypto payment gateway' 'data':61 'decim':130 'demonstr':219 'deploy':224 'document':172,202 'earli':222 'early-stag':221 'embed':70 'endpoint':6,20,30,89,109,148 'equal':132 'estim':80 'exact':140 'exampl':205 'exchang':75 'extrem':174 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'geocod':84 'grant':165 'id':41 'infrastructur':82 'json-response' 'key':157 'learn':65 'limit':160 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'made':136 'matur':233 'micropay':171 'network':102 'no-api-key' 'on-chain':168 'openapi':197 'page':182 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':210 'payment':134 'paywal':46 'per':11,25,57,94 'per-cal':10,24 'platform':50,214 'post':150 'power':228 'price':73,91 'probe':110 'product':234 'prompt':189 'protocol':106 'provid':33 'pure':166 'quot':78 'rate':76,159 'rather':230 'receipt':5,19,36,209 'render':184 'request':58,95,116,151 'request/response':200 'resourc':37 'return':112,153 'schema':201 'scheme':141 'second':145 'sentiment':66 'servic':235 'settl':96 'span':60 'spars':175 'spec':198 'specif':38,108 'stage':223 'substant':192 'suit':53 'summar':68 'timeout':146 'token':77 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unit':122 'usdc':14,28,98,124 'usdc-micropayment' 'util':83 'valid':85 'via':103,137 'wallet':188 'web3':72 'x402':2,16,45,105,139,227 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-powered':226","prices":[{"id":"04c03194-fe77-460a-970f-204ad41436af","listingId":"8c1efa2a-2269-4afe-bdbd-5322266d4fc4","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/12/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:31.570Z"}],"sources":[{"listingId":"8c1efa2a-2269-4afe-bdbd-5322266d4fc4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/12/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:31.570Z","lastSeenAt":"2026-04-25T00:05:09.574Z"}],"details":{"listingId":"8c1efa2a-2269-4afe-bdbd-5322266d4fc4","quickStartSnippet":"# 1. Send POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/12/receipt\n\n# 2. Parse the 402 JSON for payment details, sign & pay via x402 client\n# 3. Re-send POST with X-PAYMENT header containing the signed payment proof","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/12/receipt"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/transactions/12/receipt"}],"useCases":["Retrieving transaction receipt data via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to receipt information without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC payments on Base","Use cases requiring keyless, per-call API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need non-crypto payment options","Bulk data retrieval where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.867Z"},"updatedAt":"2026-04-25T00:05:09.574Z"}}